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https://issues.apache.org/jira/browse/HIVE-7302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046346#comment-14046346
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Gunther Hagleitner commented on HIVE-7302:
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Opened HIVE-7303 for the explain changes.
> Allow Auto-reducer parallelism to be turned off by a logical optimizer
> ----------------------------------------------------------------------
>
> Key: HIVE-7302
> URL: https://issues.apache.org/jira/browse/HIVE-7302
> Project: Hive
> Issue Type: Bug
> Components: Tez
> Affects Versions: 0.14.0
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: HIVE-7302.1.patch
>
>
> Auto reducer parallelism cannot be used for cases where a custom routing
> VertexManager is used.
> Allow a tri-state for ReduceSinkDesc::isAutoParallel to allow "allow,
> disable, unset" mechanics.
> The state machine for this setting will now be
> Allowed transitions
> unset -> allow
> unset -> disable
> allow -> disable
> with no transition case for
> disable -> allow.
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